Keystep + OP-Z midi issue

I switched the dipswitches on my Keystep so that it syncs to the USB midi clock. I’ve got the OP-Z plugged into the Keystep’s USB port and I’m passing the Keystep’s DIN MIDI OUT to an intellijel uMidi eurorack module. The keystep keyboard plays sounds on the OP-Z just fine UNTIL I start the sequencer on the OP-Z and then the keys no longer trigger sounds. Doesn’t matter which track the OP-Z is set to. Not sure what part of the configuration is causing this issue… I looked at the Keystep options in the Arturia MIDI Control Center app, but didn’t really see anything that looked like it would help.

Any suggestions?